Depends

If none of the DPS are good and the healer was lazy...then tank, if they were cool
If the DPS is a bard and they were great, auto get
If the healer had to babysit the godawful party, then they get it, or if they go all out and DPS (sometimes when babysitting you can't dps..rip)

If someone said "hi" or "hello" or was nice
If someone has a fun name
If someone has a fantastic glamour
then they can get it that way too.